[" 16.A bullet of mass "20g" and moving with "600m/s" collides with "],[" a block of mass "4kg" hanging with the string.What is the "],[" velocity of bullet when it comes out of block,if block rises "],[" to height "0.2m" after collision? "],[[" (a) "200m/s," (b) "150m/s," (c) "400m/s," (d) "300m/s]]